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I Patented Dec. 7,

UNITED STATES,

EDOUARD LAYRAUD, OI PARIS, FRANCE,

'ASSIGNOB- TO ETABLISSEMENTS POUI'IENC rnnnns, or rams; FRANCE.

PREPARATION"OF C-C-NORMAL BUTYL ETHYL BARBITUBIQ ACID.

No Drawing. Original application filed February 8, 1822, Serial No. 533,976, and in France February 4,.

1921. Divided and this application filed Dceember 1, 1823. Serial No.- 678,054.

This is a division ofiny patent application Serial No. 533,976, filed February 3, 1922.

A My invention relates to the synthesis of a 5 new dissyinmctric dialkyl derivative of barbituric acid, namel butyl-ethyl-barbituric acid or butyl ethy malonyl urea, a com-- pound possessing the general formula 100.11, co -m1 or o where X represents hydrogen or a metallic element.

This compound exhibits very pronounced hypnotic and sedative properties and y t possesses a very low toxlcity.

The new compound" may be readily prepared by various processes, one being the g0 treating of buty-l-ethyl-malonic ester with urea and preferably sodium to form the sodium salt of butyl-ethyl-barbituric acid, the free acid being subsequently liberated by.

the addition of hydrochloric acid, and puriv element.

fied by recrystallization.

I choose to prepare this new compoundin the following manner z-- 20 parts by weight of sodium are dissolved in 1000 parts of absolute alcohol, 50

so parts of dried urea are then added andthe ethyl barbituric acid, which" hasthe strucbituric acid is precipitated by hydrochloric acid. The product is filtered off and recrys- 40 tallized from hot water in whichit is readily soluble. On cooling, the normal butyl-ethyl barbituric acid having the formula:

(moan 0-NH co cnn co ma 4 separates in the form of white needles melting at 127 C. (corrected). This compound forms soluble salts with the alkali metals, and also combines with organic bases to form crystallized soluble salts.

Having now particularly described and set forth the nature of my said invention, and in what manner the-same is to be performed, I declare-that what I claim is '55 l. A hypnotic compound having the .formula f mean CQ-NH i IC:H5 O

if 1' I V 4 x l where X represents hydrogen or a metallic 2. The "new hypnotic compound, 'nbutylture and which is an acid crystallizing from alcoqol hol or water in white needles having a melting point of"126127-"- 0., and being only slightly soluble in water, readily soluble in many organic solvents; and having a 'very strong hypnotic activity, but low toxicity.

. I EDOUARD YLAYRAUD. 

